Himpunan terhitung
Dalam matematik, set boleh dikira jika ia mempunyai kardinaliti yang sama ( bilangan unsur set) dengan beberapa subset set nombor asli N = {0, 1, 2, 3, ...}. Setara, set S boleh dikira jika wujud fungsi injektif f : S → N dari S ke N ; ia hanya bermaksud bahawa setiap elemen dalam S sepadan dengan elemen yang berbeza dalam N.
Rujukan
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